new Arduino BT board with programming and serial communication issues

hi people, yesterday arrived my first arduino board, an arduino BT V06 i programed it with the Blink example and everything went fine, but sudenly the arduino software gave me this:

avrdude: stk500_paged_load(): (a) protocol error, expect=0x10, resp=0x0c avrdude: stk500_cmd(): programmer is out of sync

the led blinks perfectly, but the programer gave me that before it gots programed

on the program i set: setup(){ ledpin..... Serial.begin(115200); } as arduino's page said it most to be done

i dont know what is that error message and dont find any error file reference about it

i mean, i can program the board, but this error message appears it doesn't matter, but my realy big porblem is that i can't read nothing from the serial monitor. no Serial.println("whatever"); works and the program get paused on the arduino, as waiting to response to the serial monitor or something. i really dont know what's happening there.

please, if someone could help me with this, a panamenian student will be gratefull with you